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Blood in the stool or visible in tissue after wiping is a common occurrence, according to UpToDate. Most of the time, such blood is caused by conditions, such as anal fissures or hemorrhoids, that are not life threatening. Someone who notices rectal bleeding should consult a physician for an examina


Common treatments for a bloody stool include medications and anti-inflammatory drugs to suppress acid in the stomach and electric current or laser treatment to close bleeding vessels, according to WebMD. If the cause of bleeding in the stool is colon damage, surgery may be necessary.


Symptoms of black stool cancer, or bowel cancer, include bloody stools, a change in bowel habits, weight loss and a cancerous lump, reports Cancer Research UK. An abnormally low level of red blood cells, or anemia, may be present as well.


Small, hard stools are indicative of a wide range of medical and dietary conditions, but they are not the cause of cancer, according to Doctor Oz. The shape, size, color and odor of human stool can suggest the presence of several gastrointestinal conditions, including colorectal cancer.


Bloody stool indicates bleeding in the digestive tracts and may signal a potentially serious health issue, so medical evaluation and diagnosis is advised, according to WebMD. Causes of bloody stool include anal fissures, colitis, diverticular disease, peptic ulcers and esophageal problems. Polyps an


Black stool is often caused by bleeding in the upper gastrointestinal tract, specifically in the esophagus, stomach or small intestines, notes Healthgrades. Medication and other ingested substances, including black licorice, blueberries, iron supplements, lead and bismuth medicines such as Pepto-Bis


Colon cancer affects the stool by causing alternating diarrhea and constipation, according to the American Cancer Society. This type of cancer can also cause narrowing of the stool and blood in the stool.


Hemorrhoids, anal fissures, diverticulosis and colon polyps are the most common causes of blood in the stool, as confirmed by MedicineNet. Blood in the stool ranges in color from bright red to black.


Large stools are typically caused by constipation, which is a common symptom of conditions such as pregnancy, encopresis and hemorrhoids, according to Healthline, the University of Maryland Medical Center and WebMD. Constipation may also result in large hardened stools that tear parts of the anus, r


In some cases black stool indicates bleeding in the upper intestinal tract or stomach, which requires prompt medical attention, according to Mayo Clinic. Other possible causes of black stool include black liquorice, iron supplements, and medications such as Pepto-Bismol and Kaopectate.